<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Please Sign In</title>
</head>
<body>
    {% if message %}
        <p style="color:red;">{{ message }}</p>
    {% endif %}
    <form action="/signin" method="post">
        <legend>Please sign in:</legend>
        <p>username：<input name="username" placeholder="UserName" value="{{ username }}"/></p>
        <p>password：<input name="password" placeholder="Password" type="password"/></p>
        <p><button type="submit">Sign In</button></p>
    </form>
</body>
</html>